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Pixel signal processing device and pixel signal processing method

A technology of pixel signal and processing device, applied in solid-state image signal generator, image communication, picture signal generator and other directions, can solve the problems of false color, signal deviation, blackening, etc., and achieve the effect of reducing blackening or whitening

Inactive Publication Date: 2009-12-23
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, near the position where the output signal changes sharply, that is, near the boundary between a certain color and another color, the level of the generated signal deviates from the signal change curve, and blackening or whitening or artifacts may occur in the original image. color problem

Method used

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  • Pixel signal processing device and pixel signal processing method
  • Pixel signal processing device and pixel signal processing method
  • Pixel signal processing device and pixel signal processing method

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Experimental program
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Embodiment approach 1

[0036] figure 1 It is a block diagram showing the configuration of an imaging device including the pixel signal processing device according to Embodiment 1 of the present invention. The light incident from the lens 1 forms an image on the two-dimensional imaging element 2. The two-dimensional imaging element 2 is a color filter having spectral sensitivity characteristics corresponding to the three primary colors of red (R), green (G), and blue (B). according to figure 2 The configuration shown is of the Bayer type.

[0037] The two-dimensional imaging element 2 photoelectrically converts incident light, and outputs an analog pixel signal at a level corresponding to the amount of incident light for each pixel. The analog pixel signal is converted into a digital pixel signal by the A / D converter 3 , and output and stored in the frame memory 4 .

[0038]The pixel signals stored in the frame memory 4 are distributed by the demultiplexer 5 to the two-dimensional memories 6a to...

Embodiment approach 2

[0122] Figure 12 It is a block diagram showing the configuration of an imaging device including the pixel signal processing device according to Embodiment 2 of the present invention.

[0123] In the second embodiment, the configuration other than the regression analysis unit 10 and the low-pass filters 7 a to 7 c is the same as that of the first embodiment.

[0124] The regression analysis unit 10 of the present embodiment determines the image correlation around the pixel of interest before calculating the regression line. Specifically, for example, from the pixel having the output signal of the same color as the color to be generated in the deficient color of the pixel of interest, the two values ​​on the opposite side across the pixel of interest in the up and down, left and right, or oblique directions are respectively calculated. Differences in pixel output signals (pixel signals obtained by A / D converting the output of the imaging element 2 ) are compared. Then, it is ...

Embodiment approach 3

[0166] Figure 20 It is a block diagram showing the configuration of an imaging device including the pixel signal processing device according to Embodiment 3 of the present invention.

[0167] In the third embodiment, the configuration other than the regression analysis unit 12 and the arithmetic unit 13 is the same as that in the second embodiment.

[0168] In this embodiment, for a certain color, the pixel signal generated by the interpolation including regression analysis and calculation described in Embodiment 1 or Embodiment 2 above is used in the regression analysis for interpolation of other colors. Indicates variable or target variable. Hereinafter, as an example, a case will be described in which the generated signal of the G color calculated in the second embodiment is used to calculate the generated signals of the R color and the B color.

[0169] Next, the operation will be described. The interpolation steps are the same as in Embodiment 2, according to Figure...

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Abstract

A regression analysis is performed by using a pixel signal of K-th spectral response characteristic and a pixel signal of L-th spectral response characteristic as an explanation variable and an object variable, respectively in a plurality of pixel positions in a area in the vicinity of a pixel position in attention (8) and the pixel signal of the L-th spectral response characteristic is obtained (9). It is also possible to use pixel signals obtained by low-pass filtering the output signal of the imaging elements (7a to 7c) as the explanation variable and the object variable. By performing the aforementioned process, when performing interpolation of a lacking color in each pixel position of a set of pixel signals having one of the spectral response characteristics arranged on a 2-dimensional plane, it is possible to reduce generation of a false color.

Description

technical field [0001] The present invention relates to a pixel signal processing device and a pixel signal processing method, and in particular to generating the plurality of spectral sensitivities based on a group of pixel signals arranged on a two-dimensional plane and each having any one of the plurality of spectral sensitivity characteristics. A pixel signal processing device and a pixel signal processing method focusing on pixel signals of other spectral sensitivity characteristics in a pixel position where the pixel signal of one spectral sensitivity characteristic exists. [0002] Such a pixel signal processing device further includes, for example, an imaging element. Each of the imaging elements has, for example, a plurality of spectral sensitivity characteristics, such as any one of red (R), green (G), and blue (B). Since photoelectric conversion elements of various colors are arranged in, for example, a Bayer type on a two-dimensional plane, they are used as a part ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N9/07H04N23/12H04N9/03
CPCH04N9/045H04N2209/046H04N23/843H04N25/134H04N23/12
Inventor 牧田淳子守谷正太郎杉浦博明山下孝一伊藤俊久野徹也
Owner MITSUBISHI ELECTRIC CORP
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